December in Nantes averages a daily high of 10°C with nights around 3.7°C. Expect roughly 15.9 wet days totalling 100.2mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Nantes is May–September.
Based on NANTES BOUGUENAIS, FR (8.6km), 1995–2024. 30 years of December data.